Laser-induced doping and fine patterning of massively prepared luminescent ZnS nanospheres

Zhang, Zhenfeng; She, Juncong; Chen, Huanjun; Deng, Shaozhi; Xu, Ning

doi:10.1039/c3tc30714j

Cited by 5 publications

(5 citation statements)

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“…The applications of nontoxic ZnS in some fields, such as solar cells, bioimaging, sensors and optoelectronics, are limited due to the wide-band gap energy (3.6 and 3.8 eV for the zinc blende and wurtzite structures, respectively). Doping is a successful strategy to overcome this limitation since it introduces intermediate-energy levels in the band gap region [1][2][3][4]. Therefore, new electronic transitions and de-excitation paths between excited and ground states are possible and allow obtaining multiple wavelength emissions in the visible from a single excitation source [5].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Mn2+-doped ZnS by a mechanically induced self-sustaining reaction

et al. 2019

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The mechanochemical process denoted as mechanically-induced self-sustaining reaction was successfully applied in obtaining Mn-doped ZnS samples with a Mn content between 0 and 5 mol%. The process consists in milling Zn/Mn/S powder elemental mixtures with the appropriate stoichiometry, which promotes after approximately 80 min the induction of a combustion reaction. The doping level was properly adjusted by controlling the atomic ratio of the starting mixture. A complete characterization of samples was carried out, including X-ray diffraction, high-resolution transmission electron microscopy, selected area electron diffraction, energy dispersive X-ray spectroscopy, Raman spectroscopy, diffuse reflectance UV-Vis spectroscopy and emission and excitation photoluminescence measurements. A wurtzite structure, in which Mn 2+ replace Zn 2+ , was obtained with a nanometric character. The photoluminescence of samples showed the characteristic Mn 2+ 4 T1-6 A1 emission that was highly dependent on the doping level. The maximum luminescence efficiency through the ZnS excitation was found for a doping value of 1 mol%. The photoluminescence showed virtually no contribution from the host emission, which confirmed that samples were properly doped.

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Section: Introductionmentioning

confidence: 99%

Synthesis of Mn2+-doped ZnS by a mechanically induced self-sustaining reaction

et al. 2019

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“…The interest in ZnS NPs has increase mainly because of their unique properties and enormous potential in emerging technologies ranging from optoelectronic luminescent devices to photocatalysis [1][2][3][4][5][6][7][8]. It is known that bulk ZnS is an important binary semiconductor with a direct, wide bandgap (~3.6 eV), high refraction index, and high transmittance in the visible range [9,10].…”

Section: Introductionmentioning

confidence: 99%

An experimental and theoretical investigation on the optical and photocatalytic properties of ZnS nanoparticles

Porta

Nogueira

Gracia

et al. 2017

Journal of Physics and Chemistry of Solids

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From the viewpoints of materials chemistry and physical chemistry, crystal structure directly determines the electronic structure and furthermore their optical and photocatalytic properties. Zinc sulfide (ZnS) nanoparticles (NPs) with tunable photoluminescence (PL) emission and high photocatalytic activity have been obtained by means of a microwave-assisted solvothermal (MAS) method using different precursors (i.e., zinc nitrate (ZN), zinc chloride (ZC), or zinc acetate (ZA)). The morphologies, optical properties, and electronic structures of the as-synthesized ZnS NPs were characterized by X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX), Brunauer-Emmett-Teller (BET) isotherms for N 2 adsorption/desorption processes, diffuse reflectance spectroscopy (DRS), PL measurements and theoretical calculations. Density functional theory calculations were used to determine the geometries and electronic properties of bulk wurtzite (WZ) ZnS NPs and their (0001), (101 ̅0), (112 ̅0), (101 ̅1), and (101 ̅2) surfaces. The dependence of the PL emission behavior of ZnS NPs on the precursor was elucidated by examining the energy band structure and density of states. The method for degradation of Rhodamine B (RhB) was used as a probe reaction to investigate the photocatalytic activity of the as-Synthesised ZnS NPs under UV light irradiation. The PL behavior as well as photocatalytic activities of ZnS NPs were attributed to specific features of the structural and electronic structures. Increased photocatalytic degradation was observed for samples synthesized using different precursors in the following order: ZA < ZC < ZN. These results indicated that samples synthesized with ZN present a greater percentage of exposed (0001) surface than those synthesized with the ZC and ZA. Furthermore, the possible photodegradation mechanism of the as-prepared ZnS NPs were also briefly discussed.

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“…[25][26][27] Zinc sulfide (group II-VI semiconductor with direct wide band gap) nanoparticles have recently attracted significant attention because of their applications in biology and optoelectronic devices. [28][29][30][31][32] In general, the synthesis temperature has a significant effect on the crystal growth, structure and optical properties of the QDs. These studies suggest that the ideal growth temperature should be high enough to overcome the energy barrier for nucleation and growth, and low enough to result in a surface reconstruction leading to optimization of properties.…”

Section: Introductionmentioning

confidence: 99%

“…Zinc sulfide (group II-VI semiconductor, direct wide band gap) nanoparticles have recently attracted significant attention because of their applications in biology and optoelectronic devices [28][29][30][31][32]. In general, the synthesis temperature has a significant effect on the crystal growth, structure and optical properties of the QDs.…”

Section: Introductionmentioning

confidence: 99%

Self-organization of an optomagnetic CoFe₂O₄–ZnS nanocomposite: preparation and characterization

et al. 2015

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We report an advanced method for the self-organization of an optomagnetic nanocomposite composed of both fluorescent clusters (ZnS quantum dots, QDs) and magnetic nanoparticles (CoFe2O4). ZnS nanocrystals were prepared via an aqueous method at different temperatures (25, 50, 75, and 100 °C). Their structural, optical and chemical properties were comprehensively characterized by X-ray diffraction (XRD), UV-Vis, photoluminescence (PL) spectroscopy, scanning electron microscopy (SEM), dynamic light scattering (DLS), transmission electron microscopy (TEM), and infrared spectroscopy (FT-IR). The highest PL intensity was observed for the cubic ZnS nanoparticles synthesized at 75 °C which were then stabilized electrosterically using thioglycolic acid. The photophysical analysis of the capped QDs with particle size in the range 9-25 nm revealed that the emission intensity increases and the optical band gap rises compared to uncapped nanocrystals (3.88 to 4.02 eV). These band gaps are both wider than that of bulk ZnS resulting from the quantum confinement effect. Magnetic nanoparticles were synthesized via a coprecipitation route and a sol-gel process was used to form the functionalized, silica-coated CoFe2O4. Finally, thiol coordination was used for binding the QDs to the surface of the magnetic nanoparticles. The fluorescence intensity and magnetic properties of the nanocomposites are related to the ratio of ZnS and CoFe2O4. As-prepared optomagnetic nanocomposite with small size (12-45 nm), acceptable saturation magnetization (about 6.7 emu/g), and satisfactory luminescent characteristics could be successfully prepared. These are promising candidates for biological and photocatalytic applications.

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Laser-induced doping and fine patterning of massively prepared luminescent ZnS nanospheres

Cited by 5 publications

References 61 publications

Synthesis of Mn2+-doped ZnS by a mechanically induced self-sustaining reaction

Synthesis of Mn2+-doped ZnS by a mechanically induced self-sustaining reaction

An experimental and theoretical investigation on the optical and photocatalytic properties of ZnS nanoparticles

Self-organization of an optomagnetic CoFe₂O₄–ZnS nanocomposite: preparation and characterization

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Laser-induced doping and fine patterning of massively prepared luminescent ZnS nanospheres

Cited by 5 publications

References 61 publications

Synthesis of Mn2+-doped ZnS by a mechanically induced self-sustaining reaction

Synthesis of Mn2+-doped ZnS by a mechanically induced self-sustaining reaction

An experimental and theoretical investigation on the optical and photocatalytic properties of ZnS nanoparticles

Self-organization of an optomagnetic CoFe2O4–ZnS nanocomposite: preparation and characterization

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Product

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Self-organization of an optomagnetic CoFe₂O₄–ZnS nanocomposite: preparation and characterization